Core-bar



P. SHIOKLE.

(N0 ModeL) GORE BAR.

No. 819,520. Patented June 9,1885.

N r-rrzns Pholu-Liflwgrapher, Washington, D4 0.

FFICEW AT NT FREDERICK SHIOKLE, OF ST. LOUIS, MISSOURI.

CORE-BAR.

$PECIFICATION forming part of Letters Patent No. 319,520, dated June 9,1885.

Application filed June 6, 1884.

To ttZZ whom it may concern.-

Be it known that I, FREDERICK SHIOKLE, of St. Louis, Missouri, have madea new and useful Improvement in Core-Bars, of which the following is afull, clear, and exact description, reference being had to the annexeddrawings,making part of this specification, in which- Figure 1 is a viewin perspective of a corebar having the improvement; Fig. 2,alongitudinal section of the core-car; Fig. 3, an end view of thecore-bar; Fig. 4, a crosssection on the line 4 at of Fig. 2; Fig. 5, across-section on the line 5 5 of Fig. 2; Fig. 6, a detail, and Fig. 7 anelevation from within the shell of the core-bar of one of the devicesemployed in holding the movable parts of the shell together.

The same letters of reference denote the same parts.

The present invention is an improvement in what are termed collapsiblecore-bars, such as are used in casting pipes and similar castings.

A represents the improved core-bar. The cylindrical surface to which theclay is applied consists of the shell a and the strip B. The shell a iscomposed of the parts a a and the part a, the part a being attached bymeans of the brackets a a to the shaft a, and the parts ct a beinghinged at a a to the parts a The strip B is of wood or other cheap,readily combustible, or readily frangible material, and suited forinsertion between the op posing edges, a a, of the parts a a,respectively, and substantially as shown in Fig. 1, and when thusinserted the strip forms, in connection with the shell a, a continuouscylinder.

In forming the core-bar the shell is expanded-say by springingitsufficiently to admit the strip B, and the strip is preferably securedin its place between the edges a a by grooving the edges a a" andshaping the strip to fit the grooves. A modification of this would begrooving the edges of the strip, and providing the edges a a of theshell with tenons to fit into the grooves in the strip. I do not,however, wish to be confinedto any particular mode of securing the stripin its place between the edges to a"; nor do I wish to rely in holdingthe strip upon the contractile force exerted by the shell a upon theedges of the strip, although it may be desirable in.

legs a a (No model.)

practice to so construct the shell a as to enable it to contract uponand bind the strip after it has been inserted between the edges a a". Adesirable means for holding the edges against the strip is shown in thedrawing. The parts a a are respectively provided with the A tie, of,having a head, a, at one end and a slot, a at the other, is placed inthe lugs, (which are fitted to receive the tie,) and by means of a key,a, which is driven into the slot and against the adjacent lug, as shownin Fig. 7, the edges a a are drawn and held against the strip.

To keep the shell from springing out of shape, the parts a a arepreferably tied to the center of the core-bar by means 01" the chains nn The core-bar, after the strip B is inserted in the shell (I, iscompleted in the ordinary manner, as indicated in Fig. 4, in which 0represents the clay coating, and D the pipe.

In using the core-bar the heat incident to the casting of the metaloperates to char the strip B sufficiently to enable it to readily dropfrom its position in the core-bar, whereupon the parts a a are free toturn on their hinges and close toward each other, and so as to enablethe core-bar to be readily detached from the casting. In thus closingthe parts a a the ties a may be detached from the lugs. When the corebaris to be used again in forming another core, another strip, B, isinserted between the edges Me, as beforethat is, a new strip is usedevery time a core is formed.

I claim- 1. The combination of the shell a and the strip B,substantially as described.

2. The combination of the shaft a, the brackets a", the part a the partsa a, and the strip B, substantially as described.

3. The combination of the shell a, the strip B, and the ties asubstantially as described.

4. The combination of the shaft a, the brackets (6*, the parts a a a,the strip B, and the chains or a, substantially as described.

5. A core-bar, shell a, with edges a a, in combination with the strip B,for the purpose described.

Witness my hand.

FREDERICK SHIOKLE.

Witnesses:

Guns. D. MOODY, Conn E. HUNT.

